"She just found out last week," a source tells the magazine. Messer, 19, is "absolutely thrilled."

The source also claims that Messer sees her incoming twins as a way to earn more money. "She thinks the babies will help her get her own spin-off show," says the insider.""And that means a much bigger salary... She wants her own series and her own brand, just like Kate [Gosselin]."

Messer had her first set of twins with ex-husband Corey Simms. The two filed for divorce in April after being married for six months.